Non-glare headlight



L. B. SALT- NON-GLARE HEADLIGHT.

APPLICATION FIL'ED JAN. 16, 1919.

Patentedsept. 28,1920.

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UNITED STATES PATENT OFFICE.

LLOYD IB. sAL'r, or DEDHAM, MASSACHUSETTS.

NONI-GLAIRE HEADLIGHT.

Specification of Letters Patent. Patented S t 28 1920 Application filedJanu-ary 1e, 1919. Serial No. 271,502.

To all whomit may concern:

Be it known that I, LLOYD B. SALT, a citizen of the United States,residingat Dedham, in the countyof Norfolk and State of lVIassachusetts,have invented new and use-.

ful Improvements in Non Glare Hea'dlights, of which the following is aspecification.

- This invention relates to head lights, the same being particularlyadapted for use on automobiles.

The object of the invention is to provide a head light from which therays of light are reflected parallel to the axis of the reflector, saidrays of light being confined within certain limits and thereby preventedfrom becoming objectionable by dazzling-the eyesight of anyoneapproaching from a direcwhich the rays on the line 22 of Fig. 1.

Fig. 3 is a view similar to Fig. 1, illustrating a modified embodimentof my invention.

Fig. 4-is a sectional plan taken on the line 4-4 of Fig. '3.

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings, referring to Figs. 1 and 2, 5 represents a casing ofany desired shape or construction, the same having mounted therein areflector 6, provided with a-reflecting surface 7. The reflector isconstructed in the form of a parabola and is held in place in thecasing. 5 behind the usual glass 8 by a rim 9 of any suitable ornamentaldesign or construction.

A source of illumination, preferably an electric light bulb 10, ismounted in a socket 11- at the rear of the reflector'6,-the filament 12of said electric light bulb beinglocated at the focal (point of saidreflector. All the rays of light from the source of illuninationstriking the reflecting surface will Fig. 2 is a horizontal sectionalplan takenbe reflected fiector. In order to confine the rays of lightwithin certain limits, a horizontal wall 13 is provided, said wallextending from the glass 8 parallel to the axis of the rerearwardly andintersecting the reflector 6.

The under face of the wall 13 has a reflecting surface 14 and all raysof light striking said surface will be reflected downwardly. Anotherhorizontal wall 15, which is parallel to the wall 13,extends from theglass 8 rearwardly and intersects the reflector 6. Theupper face of thiswall has a non-refiecting surface 16, therefore all rays of lightstriking said surface are prevented from reflecting upwardly andoutwardly and becoming objectionable to any one who might be in thedirect path of said rays.

shield 17 is ,adjustably mounted upon the wall 13' and projectsdownwardly in front of the source of illumination, said shieldbe'ingfastened in place b means of a thumb screw 18. The rear ace of theshield 17 has a reflecting surface 19 adapted to reflect all rays oflight striking the same in a rearward direction. The shield 17 isprovided in order that the direct glow from the electric light bulb maybe obscured.

The front face of the shield '17 has a nonreflecting surface 20.

. In operation the head light throws a powerful forward beam of light,all the ra s from'the-source of illumination which strike the parabolicreflecting surface being reflected parallel-to the axis of thereflector.

P The rays of light which pass from the source 1 of illumination upwardand especially those which pass upward and forward and would be dazzlingto the eyes of a person facing said rays, strike the wall 13 and arereflected downward. 1 The direct rays passing forward from the sourceofillumination are reflected rearwardly by .the shield and'those passingdownwardly against the wall 15 are absorbed by the non-reflectingsurface 16, the result being that all the rays of light which mightdazzle the eyes and confuse anyone approaching said head light would beeliminated.

Itis obvious that the walls 13 and 15 may be vertically disposed ifnecessary, and the surfaceof said walls which are exposed to the sourceof illumination may be adapted to reflect or absorb the rays of light asdesired without departing from the spirit of my invention.

' In Figs 3 and 4 is illustrated a modified construction embodying myinvention in which a reflector 22 is provided having a reflectingsurface 23. In this form, however, the reflector is constructed in theform of a parabola only in the horizontal. plane. In the vertical planethe sides of the reflector are perfectly straight or at right angles tothe horizontal plane. An elongated electric light bulb is mounted in asocket 25 fast in a slide 26 and has a filament 27 which is locatedreflector 22.

A horizontal wall 28 extends from the glass-8 rearwardly and intersectsthe -reflector 22, said wall having a reflecting surface 29 exposed tothe source of illumination. Another horizontalwall 30 extends from theglass 8 rearwardly andintersects the reflector 22, said wall having anon-refleeting surface 31 which is exposed to the source ofillumination.

A shield 32 is fast to the slide 26, said shield having arefiectingfsurface 3-3 adapted to reflect rays of light from the sourceof illumination rearwardly and also a nonreflecting front face 35adapted to absorb any rays of light which might bereflected upon it. Theshield 32 together with the electric light bulb 24 are. adjustabletogetherwith the slide 26-upon the wall 30 and are fastened thereto by athumb screw 34;.

The Walls 28 and 30 of this form of reflector together with the shield32 perform the same functions as do the corresponding walls and shieldin the form illustrated in -Fi 8. land 2.

aving thus, specifically described my inventlon, what I claim and desireby Letters Patent to secure is:

plane having straight sides, a pairof parallel horizontal wallsintersecting said parabolic curve adapted to confine the rays of at-thefocal axis of the lel horizontal walls intersecting said para ,boliccurve adapted to confine the rays of light reflected therefrom, a slideadjustably mounted upon one of said horizontal walls, a source ofillumination mounted upon said,

slide and located upon the focal axis of said parabolic curve, and ashield adjustably" mounted uponv said slide, said shield being parallelto the source of illumination and adapted to prevent the emission ofdirect rays of light therefrom.

3 In a headlight, a reflector, said reflector in its horizontal planebeing constructed upon a parabolic curve and in its vertical planehaving straight sides, a horizontal wall intersecting the upper portionof said parabolic curve, said horizontal wall having a re-' fleetingsurface, a second horizontal wall intersecting the lower portion of saidparabolic curve, said second wall having a nonreflecting surface, aslide mounted upon said second named wall, a source of illuminationmounted upon said slide and-located upon the focal axis of saidparabolic curve, and a shield mounted upon said slide, said shield beingparallel to the source of illumination and adapted to prevent theemission of direct rays of light therefrom, said shield and said slidebeing adjustable'either independently or simultaneously relatively toeach other and to said parabolic curve. In testimony whereof. I havehereunto se my hand in presence of two subscribing witnesses.

. LLOYD B. SALT.

Witnesses:

FRANKLIN E. Low,

CHARLES S. GooDINo.

